Provide detailed description of Pipeline Control Logic in the context

1.	Provide detailed description of Pipeline Control Logic in the context of four control cases.[5 Marks]
Answer» Answer: The four control cases in PIPELINE architecture are : 1. Processing ret: The pipeline must STALL until the ret INSTRUCTION reaches the write-back stage 2. Load/user hazards: The pipeline must stall for one cycle between an instruction that reads a value from memory and an instruction that uses this value. 3. Mispredicted branches: By the time the branch logic detects that a jump should not have been taken, several instructions at the branch target will have started down the pipeline. These instructions must be removed from the pipeline. 4. Exceptions: When an instruction causes an exception, we want to disable the updating of the programmer-visible state by later instructions and halt execution once the excepting instruction reaches the write-back stage. You can get detailed information about them in the book COMPUTER SYSTEMS A Programmmer's PERSPECTIVE by Randal E.Bryant David R.O'Hallaron Good Luck

Provide detailed description of Pipeline Control Logic in the context of four control cases.[5 Marks]

Answer»

Answer:

The four control cases in PIPELINE architecture are :

1. Processing ret:

The pipeline must STALL until the ret INSTRUCTION reaches the

write-back stage

2. Load/user hazards:

The pipeline must stall for one cycle between an instruction

that reads a value from memory and an instruction that uses this value.

3. Mispredicted branches:

By the time the branch logic detects that a jump should

not have been taken, several instructions at the branch target will have

started down the pipeline. These instructions must be removed from the

pipeline.

4. Exceptions:

When an instruction causes an exception, we want to disable the

updating of the programmer-visible state by later instructions and halt

execution once the excepting instruction reaches the write-back stage.

You can get detailed information about them in the book COMPUTER SYSTEMS A Programmmer's PERSPECTIVE by Randal E.Bryant David R.O'Hallaron

Good Luck